A NEW CYPRINODONT SPECIES WITH A UNIQUELY-COLORED FEMALE, APHYOSEMIONHERA N. SP. (CYPRINODONTIFORMES, PISCES), FROM NORTHWESTERN GABON

A new species of Ayhyosemion is described from a single locality about 45 km northeast from Lambarene? within the primary forest of northwes tern Gabon. Together with some distinctive characters (the opposite in sertion of dorsal fin to anal fin, a non mood-dependant broad dark lon gitudinal band), present in both sexes, the new species exhibits, in t he female, a bright apple yellow to gold yellow coloration on belly an d strong red pigments on sides and fins. On the contrary, females of t he genus, encompassing over 120 species, are usually drab light brown with few markings. The systematic position is discussed: it is rather obscure since it does not fall into one of the eleven subgenera, as pr esently diagnosed.